public void ReplaceAllUsesIdentityComparerGivenAtConstruction()
{
IEnumerable <IntWrapper> originalItems = new IntWrapper[] { 1, 2, 3 };
var replacements = new IntWrapper[] { 1, 3 };
// NOTE: Due to conservate update check, unchanged items will appear as item changes of type update
// NOTE2: Need to use the actual instances, since IntWrapper uses reference equality
var expectedChanges = new ItemChange <IntWrapper>[]
{
new ItemChange <IntWrapper>(ChangeType.Updated, replacements[0]),
new ItemChange <IntWrapper>(ChangeType.Updated, replacements[1]),
new ItemChange <IntWrapper>(ChangeType.Removed, originalItems.ElementAt(1))
};
var loader = new ThreadSafeAsyncLoader <IntWrapper>(
Seq.ListBased,
loadDataAsync: _ => Task.FromResult(originalItems),
identityComparer: new IntWrapperComparer(),
eventContext: new RunInlineSynchronizationContext());
loader.LoadAsync(); // load initial values
loader.CollectionChanged += (s, e) =>
{
// Verify that the actual changes match the expected changes
e.Should().BeEquivalentTo(expectedChanges);
};
loader.ReplaceAll(replacements); // --- Perform ---
}